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Title |
Development of an Ultrasonic Feature Extraction Technique for Assessing Grout-Filling Quality in Precast Concrete Joint Sleeves
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Authors |
이주원(Juwon Lee) ; 김민준(Min-Jun Kim) ; 홍승주(Seungju Hong) ; 홍진영(Jin-Young Hong) ; 최하진(Hajin Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.6.699 |
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Keywords |
PC 접합부 슬리브; 그라우트 충전 상태; 비파괴 기법; 초음파; 스펙트럼 분석 PC joint sleeves; grout filling quality; non-destructive testing; ultrasound; spectrum analysis |
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Abstract |
This study focuses on the development of a feature extraction technique based on ultrasonic testing for the purpose of evaluating the grout-filling quality of precast concrete (PC) joint sleeves. Existing grout-filling quality inspection methods, such as visual examination, are limited in their ability to assess internal filling quality after construction. To address this issue, PC joint sleeve specimens were designed and validated to reflect potential internal filling deficiencies that may occur in actual construction environments. Dry-coupled ultrasonic transducers were applied, and the excitation frequency was optimized to enhance field applicability. The collected ultrasonic signals were analyzed using a frequency feature extraction algorithm, which successfully distinguished between unfilled and filled specimens. These findings suggest that the proposed method can effectively identify differences in grout-filling quality. Future research will involve experimental validation incorporating variables such as the rebar eccentricity, partial grout filling inside the sleeves, and grout curing age.
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